2" Goethite (Limonite) Pseudomorph after Marcasite - Egypt
This is a 2" wide limonite pseudomorph after marcasite.
This specimen was collected from the White Desert near Farafra Oasis, Egypt. These mineral aggregates, known by many as "Prophecy Stones", have been collected for years from the Cretaceous age Khoman Chalk of the White Desert. Studies have been conducted to verify this mineral's composition, however the specific age of formation is unknown. While they're collected from a Cretaceous deposit, studies suggest that they formed post deposition.
White Desert, Near Farafra Oasis, Egypt